When ANPR Cameras Get It Wrong — And How to Prove It

Published: 10 January 2026

Automatic Number Plate Recognition cameras are everywhere — supermarket car parks, hospitals, retail parks, motorway service stations. But they're far from infallible. Here's what to do when the camera gets it wrong.

How ANPR Works

ANPR cameras capture an image of your vehicle's number plate as you enter and exit a car park. Software then converts that image into text — your registration number — and logs the entry and exit times. If the system calculates that you've overstayed (or failed to pay, or breached some other condition), a parking charge is generated and sent to the registered keeper via the DVLA.

The technology is fast and widely deployed, but it relies on the camera getting a clear, correctly angled shot of your plate and the software reading every character accurately. That's where things can — and regularly do — go wrong.

Common ANPR Errors

The most frequent ANPR mistakes fall into a few categories:

• Character misreads: The software confuses similar-looking characters. Common swaps include O and 0, I and 1, B and 8, S and 5, and D and 0. A single character error means the charge goes to the wrong person entirely.
• Partial reads: The camera captures only part of the plate — perhaps because another vehicle was close behind, or the plate was partially obscured by a tow bar or bike rack. The system may then try to "guess" the full registration.
• Missing entry or exit: If the camera fails to capture either the entry or exit event, the system can't calculate how long you were parked. Some operators assume the worst — treating a missing exit as an all-day stay — which is clearly unfair.
• Motorcycle and trailer plates: Rear-only plates on motorcycles and smaller trailer plates are notoriously difficult for ANPR systems, leading to higher error rates.
• Cloned or similar plates: In rare cases, a charge is generated because another vehicle with a cloned or very similar registration was in the car park. This is more common than most people realise.

How to Request ANPR Images

Here's the crucial step most people miss: you have the right to request the ANPR images. Under data protection law (specifically the UK GDPR), you can make a Subject Access Request (SAR) to the parking operator, asking for all data they hold about your vehicle — including the entry and exit photographs.

The operator must respond within one calendar month. When the images arrive, examine them carefully. Is the registration clearly readable? Do the photos actually show your vehicle? Can you see both the entry and exit shots? If anything looks off, you have a strong basis for appeal.

You can also request images as part of your appeal itself. Both POPLA and IAS expect operators to provide photographic evidence when challenged — and if they can't produce clear images, that weakness is very much in your favour.

Using Camera Errors in Your Appeal

If you've identified an ANPR error, your appeal should focus on the factual evidence. Here's what to include:

• A clear statement that you're disputing the accuracy of the ANPR reading
• The ANPR images themselves (if you have them), highlighting any discrepancies
• A photo of your actual number plate for comparison
• If applicable, evidence that you weren't at the location on the date in question (sat-nav data, work records, etc.)
• If entry or exit data is missing, a statement pointing out that the operator cannot prove the duration of your stay

POPLA and IAS assessors are well aware of ANPR limitations. A clearly presented case showing that the camera made an error will almost always result in the charge being cancelled.

The Bigger Problem

The wider issue is that ANPR-based parking enforcement places the burden of proof on the motorist. You receive a charge, and you have to demonstrate that the camera got it wrong — rather than the operator having to prove the camera got it right. While appeal bodies do expect operators to provide evidence, the initial presumption is that the technology works.

This is one reason why requesting images early is so important. If the operator can't provide clear photographic evidence, the burden shifts back to them — and without evidence, their case falls apart.

Related Guides

• How to Appeal a Private Parking Charge
• Supermarket Parking Fine Appeal
• How to Appeal a ParkingEye Charge